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      Java基础：修饰符
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	Posted on <a href="/2017/05/11/Java基础：修饰符/" class="article-date">
	  <time datetime="2017-05-11T05:04:09.000Z" itemprop="datePublished">May 11, 2017</time>
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        <!-- TOC -->
<ul>
<li><a href="#权限修饰符">权限修饰符</a></li>
<li><a href="#常用来修饰类方法变量的修饰符如下">常用来修饰类、方法、变量的修饰符如下：</a></li>
<li><a href="#不能同时使用的修饰符">不能同时使用的修饰符</a><ul>
<li><a href="#修饰类能够使用的修饰符">修饰类能够使用的修饰符：</a></li>
</ul>
</li>
<li><a href="#修饰成员变量能够使用的修饰符">修饰成员变量能够使用的修饰符：</a></li>
<li><a href="#修饰构造方法能够使用的修饰符">修饰构造方法能够使用的修饰符：</a></li>
<li><a href="#修饰成员方法能够使用的修饰符">修饰成员方法能够使用的修饰符：</a></li>
</ul>
<!-- /TOC -->
<h3 id="权限修饰符"><a href="#权限修饰符" class="headerlink" title="权限修饰符"></a>权限修饰符</h3><ul>
<li>权限修饰符有哪些<ul>
<li>在Java中提供了四种访问权限，使用不同的访问权限时，被修饰的内容会有不同的访问权限  </li>
</ul>
</li>
</ul>
<table>
<thead>
<tr>
<th style="text-align:left">范围</th>
<th style="text-align:left">public</th>
<th style="text-align:left">protected</th>
<th style="text-align:left">default</th>
<th style="text-align:left">private</th>
</tr>
</thead>
<tbody>
<tr>
<td style="text-align:left">同一类中</td>
<td style="text-align:left">✔</td>
<td style="text-align:left">✔</td>
<td style="text-align:left">✔</td>
<td style="text-align:left">✔</td>
</tr>
<tr>
<td style="text-align:left">同一包中(子类与无关类)</td>
<td style="text-align:left">✔</td>
<td style="text-align:left">✔</td>
<td style="text-align:left">✔</td>
<td style="text-align:left"></td>
</tr>
<tr>
<td style="text-align:left">不同包的子类</td>
<td style="text-align:left">✔</td>
<td style="text-align:left">✔</td>
<td style="text-align:left"></td>
<td style="text-align:left"></td>
</tr>
<tr>
<td style="text-align:left">不同包中的无关类</td>
<td style="text-align:left">✔</td>
<td style="text-align:left"></td>
<td style="text-align:left"></td>
</tr>
</tbody>
</table>
<a id="more"></a>
<ul>
<li>要想仅能在本类中访问使用<code>private</code>修饰；</li>
<li>要想本包中的类都可以访问不加修饰符即可；</li>
<li>要想本包中的类与其他包中的子类可以访问使用<code>protected</code>修饰</li>
<li>要想所有包中的所有类都可以访问使用<code>public</code>修饰。</li>
<li>如果类用public修饰，则类名必须与文件名相同。一个文件中只能有一个<code>public</code>修饰的类。</li>
</ul>
<h3 id="常用来修饰类、方法、变量的修饰符如下："><a href="#常用来修饰类、方法、变量的修饰符如下：" class="headerlink" title="常用来修饰类、方法、变量的修饰符如下："></a>常用来修饰类、方法、变量的修饰符如下：</h3><ul>
<li><code>public</code> 权限修饰符，公共访问, 类,方法,成员变量</li>
<li><code>protected</code> 权限修饰符，受保护访问, 方法,成员变量</li>
<li>默认什么也不写 也是一种权限修饰符，默认访问, 类,方法,成员变量</li>
<li><code>private</code> 权限修饰符，私有访问, 方法,成员变量</li>
<li><code>static</code> 静态修饰符  方法,成员变量</li>
<li><code>final</code> 最终修饰符   类,方法,成员变量,局部变量</li>
<li><code>abstract</code> 抽象修饰符  类 ,方法</li>
</ul>
<h3 id="不能同时使用的修饰符"><a href="#不能同时使用的修饰符" class="headerlink" title="不能同时使用的修饰符"></a>不能同时使用的修饰符</h3><ul>
<li><code>abstract</code>与<code>private</code>不能同时使用；</li>
<li><code>abstract</code>与<code>static</code>不能同时使用；</li>
<li><code>abstract</code>与<code>final</code>不能同时使用。</li>
</ul>
<h4 id="修饰类能够使用的修饰符："><a href="#修饰类能够使用的修饰符：" class="headerlink" title="修饰类能够使用的修饰符："></a>修饰类能够使用的修饰符：</h4><ul>
<li>修饰类只能使用<code>public</code>、默认的、<code>final</code>、<code>abstract</code>关键字</li>
<li>使用最多的是<code>public</code>关键字<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Test</span> </span>&#123;&#125; <span class="comment">//最常用的方式</span></span><br><span class="line"><span class="class"><span class="keyword">class</span> <span class="title">Test2</span></span>&#123;&#125;</span><br><span class="line"><span class="keyword">public</span> <span class="keyword">final</span> <span class="class"><span class="keyword">class</span> <span class="title">Test3</span></span>&#123;&#125;</span><br><span class="line"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="class"><span class="keyword">class</span> <span class="title">Test4</span></span>&#123;&#125;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="修饰成员变量能够使用的修饰符："><a href="#修饰成员变量能够使用的修饰符：" class="headerlink" title="修饰成员变量能够使用的修饰符："></a>修饰成员变量能够使用的修饰符：</h3><ul>
<li><code>public</code> : 公共的</li>
<li><code>protected</code> : 受保护的</li>
<li>: 默认的</li>
<li><code>private</code> ：私有的</li>
<li><code>final</code> : 最终的</li>
<li><code>static</code> : 静态的</li>
<li>使用最多的是<code>private</code><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">int</span> i = <span class="number">100</span>;</span><br><span class="line"><span class="keyword">protected</span> <span class="keyword">int</span> i2 = <span class="number">100</span>;</span><br><span class="line"><span class="keyword">int</span> i3 = <span class="number">100</span>;</span><br><span class="line"><span class="keyword">private</span> <span class="keyword">int</span> i4 = <span class="number">100</span>; <span class="comment">//最常用的方式</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">int</span> i5 = <span class="number">100</span>;</span><br><span class="line"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">int</span> i6 = <span class="number">100</span>;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="修饰构造方法能够使用的修饰符："><a href="#修饰构造方法能够使用的修饰符：" class="headerlink" title="修饰构造方法能够使用的修饰符："></a>修饰构造方法能够使用的修饰符：</h3><ul>
<li><code>public</code> : 公共的</li>
<li><code>protected</code> : 受保护的</li>
<li>: 默认的</li>
<li><code>private</code> ：私有的</li>
<li>使用最多的是<code>public</code><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="title">Test</span><span class="params">()</span></span>&#123;&#125; <span class="comment">//最常用的方式</span></span><br><span class="line"><span class="function"><span class="keyword">protected</span> <span class="title">Test</span><span class="params">()</span></span>&#123;&#125;</span><br><span class="line">Test()&#123;&#125;</span><br><span class="line"><span class="function"><span class="keyword">private</span> <span class="title">Test</span><span class="params">()</span></span>&#123;&#125;</span><br></pre></td></tr></table></figure>
</li>
</ul>
<h3 id="修饰成员方法能够使用的修饰符："><a href="#修饰成员方法能够使用的修饰符：" class="headerlink" title="修饰成员方法能够使用的修饰符："></a>修饰成员方法能够使用的修饰符：</h3><ul>
<li><code>public</code> : 公共的</li>
<li><code>protected</code> : 受保护的</li>
<li>: 默认的</li>
<li><code>private</code> ：私有的</li>
<li><code>final</code> : 最终的</li>
<li><code>static</code> : 静态的</li>
<li><code>abstract</code> : 抽象的</li>
<li>使用最多的是<code>public</code><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">method1</span><span class="params">()</span></span>&#123;&#125;<span class="comment">//最常用的方式</span></span><br><span class="line"><span class="function"><span class="keyword">protected</span> <span class="keyword">void</span> <span class="title">method2</span><span class="params">()</span></span>&#123;&#125;</span><br><span class="line"><span class="function"><span class="keyword">void</span> <span class="title">method3</span><span class="params">()</span></span>&#123;&#125;</span><br><span class="line"><span class="function"><span class="keyword">private</span> <span class="keyword">void</span> <span class="title">method4</span><span class="params">()</span></span>&#123;&#125;</span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">final</span> <span class="keyword">void</span> <span class="title">method5</span><span class="params">()</span></span>&#123;&#125;</span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">method6</span><span class="params">()</span></span>&#123;&#125;<span class="comment">//最常用的方式</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">void</span> <span class="title">method7</span><span class="params">()</span></span>;<span class="comment">//最常用的方式</span></span><br></pre></td></tr></table></figure>
</li>
</ul>

      
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      <ol class="nav"><li class="nav-item nav-level-3"><a class="nav-link" href="#权限修饰符"><span class="nav-number">1.</span> <span class="nav-text">权限修饰符</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#常用来修饰类、方法、变量的修饰符如下："><span class="nav-number">2.</span> <span class="nav-text">常用来修饰类、方法、变量的修饰符如下：</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#不能同时使用的修饰符"><span class="nav-number">3.</span> <span class="nav-text">不能同时使用的修饰符</span></a><ol class="nav-child"><li class="nav-item nav-level-4"><a class="nav-link" href="#修饰类能够使用的修饰符："><span class="nav-number">3.1.</span> <span class="nav-text">修饰类能够使用的修饰符：</span></a></li></ol></li><li class="nav-item nav-level-3"><a class="nav-link" href="#修饰成员变量能够使用的修饰符："><span class="nav-number">4.</span> <span class="nav-text">修饰成员变量能够使用的修饰符：</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#修饰构造方法能够使用的修饰符："><span class="nav-number">5.</span> <span class="nav-text">修饰构造方法能够使用的修饰符：</span></a></li><li class="nav-item nav-level-3"><a class="nav-link" href="#修饰成员方法能够使用的修饰符："><span class="nav-number">6.</span> <span class="nav-text">修饰成员方法能够使用的修饰符：</span></a></li></ol>
    
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